Step 1:Log in to your SegMate account. Hover your mouse cursor over Settings in the bottom left corner and select Integrations. Add New Integration.
Step 2: Add Nickname > Select a Service > Add API KEY. Then click Save Changes.
Note: You need to log in to your Mailchimp account in order to get your API KEY. Go to your Account, click Extras, under that you can find and click API Keys. Click Create a Key. Then you can copy and paste your API KEY.
To learn more about the General 3rd party Integration Settings for SegMate, please click HERE.